master_assassin_validity_trigger

master_assassin_validity_trigger = {
	base_court_position_validity_trigger = { EMPLOYER = $EMPLOYER$ }
	is_playable_character = no # You can't be a public figure and a master assassin
	custom_tooltip = {
		text = none_has_no_particular_noble_roots_trigger
		has_no_particular_noble_roots_trigger = yes
	}
	custom_tooltip = {
		text = NONE_NOT_THE_SPOUSE_OF_CHARACTER_COURT_POSITION
		NOT = { is_spouse_of = $EMPLOYER$ }
	}
	custom_tooltip = {
		text = faith_allows_master_assassin
		rite = {
			rite_has_parameter = master_assassin_court_position_unlocked
			NOR = {
				rite_has_tenet = tenet_pacifism
				rite_has_tenet = tenet_dharmic_pacifism 
			}
		}
	}
	court_position_can_be_combatant_tt_trigger = { EMPLOYER = $EMPLOYER$ }
	custom_tooltip = {
		text = none_does_not_have_a_full_time_job
		trigger_if = {
			limit = { NOT = { has_court_position = master_assassin_court_position } }
			court_position_does_not_already_have_a_job_trigger = yes # This positions is considered a job, and cannot be held at the same time as another similar position
		}
	}
}

As written in game/common/scripted_triggers/00_court_position_triggers.txt.